From 8e1ddbd592c3aaf02a58789771f891c0101c6e05 Mon Sep 17 00:00:00 2001
From: Xiang Zhang <angwerzx@126.com>
Date: Mon, 17 Apr 2017 00:54:21 +0800
Subject: [PATCH] fix a refleak in slot_sq_length (#1162)

---
 Objects/typeobject.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 89fe82c7c39..9eb725f062b 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -5931,6 +5931,7 @@ slot_sq_length(PyObject *self)
 
     assert(PyLong_Check(res));
     if (Py_SIZE(res) < 0) {
+        Py_DECREF(res);
         PyErr_SetString(PyExc_ValueError,
                         "__len__() should return >= 0");
         return -1;